National Geologic Map Database

Geologic Unit: Jefferson City


Jefferson City Dolomite (AR*,IL*,MO*)
Jefferson City Dolomite of Arbuckle Group (OK*, and KS*-subsurface)
Cotter Dolomite and Jefferson City Dolomite, undifferentiated (AR, and KS-subsurface)
Cotter Formation and Jefferson City Formation, undifferentiated (AR)

Geologic age:

Ordovician, Early*

Type section, locality, area and/or origin of name:

Type section (composite): sections along south bluffs of Missouri River valley, beginning east of Jefferson City at mouth of Moreau River, northwest corner of sec. 24 or southwest corner of sec. 13, T. 44 N., R. 11 W., Osage City 7.5-min quadrangle, and extending west-northwest to mouth of Grays Creek, west of Jefferson City, center sec. 35, T. 45 N., R. 12 W., Jefferson City 7.5-min quadrangle, Cole Co., MO (in 1894 possibly located at SW/4 SE/4 sec. 27, T. 45 N., R. 12 W.) (Winslow, 1894; Thompson, 1991).
Reference sections: (1) New construction on U.S. Highway 50, T. 44 N., R. 11 E., Cole Co., central MO; and (2) new roadcut on U.S. Highway 63 immediately south of Westphalia, SW/4 NE/4 sec. 35 and SW/4 sec. 36, T. 43 N., R. 10 W., Westphalia East 7.5-min quadrangle, Osage Co., MO (Thompson, 1991).

AAPG geologic province:

Ozark uplift*
Illinois basin*
Upper Mississippi embayment*
Cherokee basin*
Chautauqua platform*
Salina basin*
Central Kansas uplift*
Forest City basin*
Nemaha anticline*
Anadarko basin*
Arkoma basin*

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).